云母型含钒石煤灰渣空白焙烧提钒试验研究  

Additive-Free Roasting Technique for Extracting Vanadium from Residue of Mica-Type Vanadium-Bearing Stone Coal

作　　者：李龙涛[1] 祝培旺[1] 施正伦[1] 蒋啸[1] 曾伟强[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《稀有金属》2014年第3期480-486,共7页Chinese Journal of Rare Metals

基　　金：浙江省自然科学基金项目(Y1080393)资助

摘　　要：为探究云母型含钒石煤空白焙烧提钒工艺的可行性,以西北某地云母型含钒石煤为研究对象,对石煤进行循环流化床燃烧利用其热能后,通过细磨技术对石煤灰渣进行预处理,同时,针对灰渣粒度、焙烧温度、焙烧时间、空气流量等焙烧因素对钒转浸率的影响作用,对细磨处理后的灰渣进行了空白焙烧的相关试验研究。研究结果表明:焙烧温度对钒转浸率的提高有显著影响,焙烧过程中,较低的焙烧温度不能有效破坏钒云母晶格结构,当焙烧温度足以有效破坏云母晶格结构时,若低价钒不能被氧化成高价态含钒化合物,钒也难以浸出;焙烧过程中,氧化性气氛的存在一方面将释放出来的低价钒氧化成高价态含钒化合物,同时有助于促进含钒云母晶格中钒的释放;经细磨预处理的石煤灰渣进行高温空白焙烧后,在常温(20℃)、低酸(0.54 mol·L-1H2SO4)、无助浸剂、静置2 h等酸浸条件下进行酸浸,钒转浸率可达83.81%,这表明对云母型含钒石煤进行空白焙烧提钒是可行的。To explore the feasibility of vanadium extraction from residue of mica-type stone coal containing vanadium by additive-free roasting process, with mica-type stone coal from the northwest of China as the research object, heat energy of stone coal was obtained by circulating fluid bed combustion. The combustion residue was processed through fine grinding technology and additive-free roasting. In the roasting process, experiments were carried out to figure out the effect of the particle size of residue, roasting temperature, roast- ing time and air velocity on the leaching rate of vanadium. The resuhs showed that roasting temperature had a significant influence on the increase of vanadium recovery, lower roasting temperature could not effectively destroy the lattice structure of roscoelite. And when roasting temperature was high enough to effectively destroy the lattice structure of mica, it was still difficult to extract vanadium if low valence vanadium separated from roscoelite could not be oxidized to the high valence compound containing vanadium. In the roasting process, an oxidizing atmosphere contributed to oxidize low valence vanadium to the high valence compound containing vanadium and ac- celerated the separation of low valence vanadium from roscoelite. It was feasible to extract vanadium from mica-type stone coal containing vanadium by fine grinding technology and additive-free roasting process, under the acid leaching conditions of 20 ℃, sulfuric acid concentration of 0.54 mol ·L^-1 , no helper leaching agent and standing for 2 h, the leaching rate of vanadium could reach 83.81%.

关 键 词：石煤 空白焙烧 钒转浸率 细磨 钒 

分 类 号：TF841.3[冶金工程—有色金属冶金]